Confused about fats!!!

Confused about fats!!!

i know saturated fat is bad stuff, but are the polyun sats and monounsats actually GOOD for you. Also i've been using lowest fat spread available but seen people recommend olive spread, this is higher sat fat but is it better??? and which are good out of olive,sunflower,vegetable,etc. oils? and is it still better to avoid foods fried or cooked in them? I'M LOST!!!